313D Load Calculation and Blueprints Questions and Answers

Question 1

When reviewing a set of mechanical blueprints for a new residential installation, where should a technician first look to understand what a specific symbol, such as a square with an 'X' inside, represents?

Accepted Answer

The legend or symbol list

Answer

The equipment schedule

Answer

The architectural floor plan

Answer

The general notes section

Question 2

According to ACCA Manual J, which of the following factors is NOT a primary component in calculating the cooling load (heat gain) for a residential structure?

Accepted Answer

The age of the existing furnace

Answer

The R-value of wall and ceiling insulation

Answer

The geographical location and orientation of the home

Answer

The number and type of windows

Question 3

A technician is performing a Manual J load calculation for a four-bedroom house. Based on standard ACCA guidelines, how many occupants should be factored into the internal heat gain calculation?

Accepted Answer

5

Answer

4

Answer

2

Answer

8

Question 4

On an architectural floor plan, a technician needs to determine the total area of windows on the west-facing wall to calculate solar heat gain. Which part of the blueprints would provide the specific dimensions for these windows?

Accepted Answer

The window schedule or elevation drawings

Answer

The mechanical schedule

Answer

The electrical plan

Answer

The plumbing riser diagram

Question 5

Which of the following describes a 'sensible' heat gain, which must be accounted for in a residential load calculation?

Accepted Answer

Heat conducted through a ceiling from a hot attic

Answer

Heat generated by occupants' respiration and perspiration

Answer

Moisture added to the air from cooking and showers

Answer

Humidity infiltrating from the outside on a humid day

Question 6

A blueprint's mechanical plan shows a duct line labeled '12x8' and an airflow value of '400 CFM'. What do these two pieces of information represent?

Accepted Answer

The duct's dimensions in inches (width x height) and the volume of air it must carry.

Answer

The duct's length in feet and its required insulation R-value.

Answer

The size of the air filter and the fan motor's horsepower.

Answer

The gauge of the sheet metal and the maximum allowable static pressure.